This is a free online volcano database, with information about all the currently known volcanoes. Every volcano features the basic statistics, as well as a very detailed map, with bot urban and satellite photos, and a google earth placeholder.

Professional tsunami database with information about the currently known tsunamis in history, with RSS feeds and a tsunami search engine

Professional earthquake database with information about the currently known earthquakes in history, with RSS feeds and an earthquake

This is a review site which gives complete information on National Geographic. This National Geographic Society is one of the educational and scientific organization, headquarters at Washington.The organization sponsors and funds scientific research and exploration.